HARDtalk - Edward Dolman, Chairman, Christie's International

As the wealthy shy away from investing in the world's volatile stock markets, the idea of investing in alternative markets is becoming more popular. Art is being seen as a better investment than stocks and shares. But should it be that way, and what effect is it having on artists and their creativity? Edward Dolman is the Chairman of Christie's International, one of the world's best known auction houses. Sarah Montague asks him if art has become an investment just like any other.